Marketing refers to activities a company undertakes to promote the buying or selling of a product or service. Marketing includes advertising, selling, and delivering products to consumers or other businesses. Some marketing is done by affiliates on behalf of a company. Advertising is a marketing tactic involving paying for space to promote a product, service, or cause. The actual promotional messages are called advertisements, or ads for short. The goal of advertising is to reach people most likely to be willing to pay for a company s products or services and entice them to buy. At its core, public relations is about influencing, engaging and building a relationship with key stakeholders across numerous platforms in order to shape and frame the public perception of an organization.